Quadtrees aren't limited to point data. They can also partition regions of continuous data, like the pixels of an image.
Maddie MolloyClimate & science reporter
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Now the astronauts have arrived home, they will soon be taken to the Johnson Space Centre in Houston, Texas, where they will be checked over by medical experts.
He called for an "immediate package of support to clean up the sewage spills that have poured into Hampshire's rivers" over the winter.